#include <avr/io.h>
#include <avr/interrupt.h>

#define S2 250000UL
#define NOKEY 0x7f
#define DELAY 200
#define clrbit(var,bit) var &= ~(1<<bit)
#define setbit(var,bit) var |= 1<<bit
#define OCIE2 7
#define IF 7

void sysinit();
void putchLCD(char ch);
void putsLCD (char* ch);
void clrLCD();
void wait(unsigned long int val);
void gotoLC(unsigned char line, unsigned char col);
char kbscan();

int main(){

   char code_ante = NOKEY;
   char code_now = NOKEY;
   unsigned char kbhit = 0;
   char kbcode;
   unsigned char loop_cnt=0;

   sysinit();

   TCCR2 = 0b00001110;

   OCR2 = 250 - 1;

   setbit(TIMSK,OCIE2);

   setbit(SREG,IF);

   while(1){

      if(loop_cnt==DELAY){ //citirile se fac din 15 ms in 15 ms
         loop_cnt=0;
         code_ante = code_now;
         code_now = kbscan();
         if( code_ante == NOKEY && code_now != NOKEY){
            kbhit=1;
            kbcode=code_now;
         }
      }

      if(kbhit){
         kbhit=0;
         gotoLC(1, 1);
         putchLCD(kbcode);
         wait(5*250000); //aşteapă 0,1 secunde
         gotoLC(1,1);
         putchLCD(' ');
         gotoLC(1,1);

      }

      loop_cnt++;

      }

   }

      ISR(TIMER2_COMP_vect)
      {

         static unsigned int cycles = 0;
         static unsigned char s = 00;
         static unsigned char m = 35;
         static unsigned char h = 10;
         unsigned char d;

         cycles++;

         if(cycles == 125)
         {
            cycles = 0;
            s++;

            if(s == 60)
            {
               s = 0;
               m++;
            }

            if(m == 60)
            {

               m = 0;
               h++;
            }

            if(h == 24)
            {
               h = 0;
            }

            gotoLC(2, 1);

            if(h > 9)
            {
                d = h / 10 +'0';
                putchLCD(d);
                d = h % 10 + '0';
                putchLCD(d);
            }

            else
            {
               putchLCD(' ');
               d = h % 10 + '0';
               putchLCD(d);
            }

            putchLCD(':');
            d = m / 10 + '0';
            putchLCD(d);
            d = m % 10 + '0';
            putchLCD(d);

            putchLCD(':');

            d = s / 10 + '0';
            putchLCD(d);
            d = s % 10 + '0';
            putchLCD(d);

            if(TIFR & 1<<OCF2)
            {
               clrLCD();
               putsLCD("ERROR");
               while(1){}
            }


      }


   }